6. (FRESENIUS'S FLUX.) Carbonate of potassa (dry), 3 parts; cyanide of
potassium, 1 part. For the arsenical compounds.
7. (LIEBIG'S FLUX.) Carbonate of soda (dry) and cyanide of potassium,
equal parts. As the last. See ARSENIOUS ACID.
8. (MORVEAU'S REDUCING FLUX.) Powdered glass (free from lead), 8 parts;
calcined borax and charcoal, of each, 1 part; all in fine powder, and
triturated well together. Used as BLACK FLUX.